I saw Vestmans double GPS`s afterwards, they had both stopped at 300 KMH - they don`t seem to work after that speed. his speedometer was showing 342 kmh, like 213 MPH !
The light green propster shown in picture below ( battery driven propeller and ice skates) had difficulty in the car and bike tracks, it could have gone faster, but the driver was on his maiden voyage.
A few of the cars were over 250 kmh, over 150 MPH